Install Error

Hi,
I can´t install Virtualmin on my VPS.
What´s wrong?

Installing virtualmin-lamp-stack [=>—]
[ERROR]
[ERROR] Something went wrong with the previous command. Exiting.

Preparing to unpack …/libconfig-inifiles-perl_2.88-1_all.deb …
Unpacking libconfig-inifiles-perl (2.88-1) …
Processing triggers for fontconfig (2.11.94-0ubuntu1.1) …
Processing triggers for libc-bin (2.23-0ubuntu10) …
Processing triggers for man-db (2.7.5-1) …
Processing triggers for systemd (229-4ubuntu21.10) …
Processing triggers for dbus (1.10.6-1ubuntu3.3) …
Errors were encountered while processing:
/var/cache/apt/archives/dovecot-core_1%3a2.2.22-1ubuntu2.8_amd64.deb
/var/cache/apt/archives/dovecot-imapd_1%3a2.2.22-1ubuntu2.8_amd64.deb
/var/cache/apt/archives/dovecot-pop3d_1%3a2.2.22-1ubuntu2.8_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Installing virtualmin-lamp-stack: Failed with error: 100
[2018-12-05 22:08:20 CET] [ERROR] Something went wrong with the previous command. Exiting.